Speed limits are ultimately determined by safety. In California, the speed limit on residential streets is (generally) 25 mph. But if there is a proven history of speeding (usually resulting from multiple complaints from multiple residents over a period of time) in a particular neighborhood, speed bumps may be installed, along with a lowering of the speed limit to 15mph.
2nd Answer:
Traffic engineers test how much friction various pavements have, and how much friction various tires have. They look at those friction also for wet pavements. From that they calculate what distance a vehicle might need to stop in and be safe. Using the distance and friction factors, they calculate the maximum speed an average vehicle must go in order to stop in that calculated safe distance.
55 on the highway, and 30 in the city.
is 30 MPH in residential,
45 MPH
it is 30 mph
Business and residential areas is 30 mph
70 mph daytime/ 65mph nightime 85 80 MPH (daylight hours only) 60 miles per hour daytime 60 nighttime 55 Day time 70 & Night time 65.
The humps do not affect the speed limit. Other signs will indicate the speed limit. In most towns and cities the default limit is 30 mph, but in some places it can be less.
40 mph
True
59 mph
were the speed limit exceeds 30 mph
if im not mistaken its 20-30 mph